Are you sure about this? Everywhere i look there is no reference to this. There are some conversations that say this cant be done and that you have to reimage. I know you can remove patches but I havent heard anything else.

Can you please check to see if this is supported? I thought that most version upgrades involved major database changes which were irreversible. So the only way to get back down from an acs 5.3 to acs 5.2 was to reimage install the last patch that my old database was on, and restore my old database.